HTR-5920
10
HTR-5920
■
MAINTENANCE FLOW CHART
NO
NO
NO
YES YES
YES
YES
YES
YES
YES
Power on
Is FL display
turns on?
Are all keys
on front panel
work well?
Is connection
of cable
correct?
Are voltages
of BN82 (pin 1
to 4) correct?
Check connection
of cable
NO
NO
NO
NO
Check power supply
of BN82
Check and replace
IC81
Check
power supply part
Check KEY IN part
(S851-854, S858-863,
S865-871)
Are waveforms
of IC81 (pin 34 to 67)
correct?
Check and replace
FL display
Are input ports
of IC81 (pin76 to 78)
work correct?
Check and replace IC81
Start
Is power voltage
of each board
correct?
A
FR
ONT P
.C
.B
. 1/3
• FRONT P.C.B.
